What you need to find first, is what is the circumference of the rim, which isOriginally Posted bylaser2302

Now you need to find how many revolutions per second the rim goes, which is the amount rpm divide by 60

now we multiply the circumference by the rps and we get the answer...

that gives us cm/s so we divide by 100 to get m/s

and that is the answer in m/s (I don't have a calc. handy so you need to solve)

If 8tins are required for 4 coats, than only 2 tins are required for 1 coat. If 2 tins are required to cover 50m^2, than 1 tin will cover 25m^2.Originally Posted bylaser2302

Now we need to figure out how many tins are required to cover 70m^2 with 1 coat. So we divide 70 by 25,

so 2 and 2/5 tins are required for 1 coat, so now we multiply by 5 to get all 5 coats.

therefore, 12 tins are needed.